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what is astronomy

Have you ever looked up in the sky and wondered what life would be like if you lived on Mars? Astronomy is the study of the universe, or outer space, and can help you find the answer to your question. ... read more

waves, sound, and light

Light and sound are two of the most important forms of energy to humans. People see light and hear sound. Light from the Sun makes life on Earth possible. Sound is one of the most important ways that animals and humans communicate. Both sound and light travel as waves. Light also behaves like a partic... read more

what is an animal

Animals are living creatures. They include very small creatures such as dust mites and very large creatures such as whales. Animals are multi-cellular organisms that eat food to survive. They cannot get energy from the sun like plants do. Most animals can move on their own. ... read more

heat

Heat is a form of energy. It is created when molecules (small pieces) in an object move around. The study of heat and how it is used is called thermodynamics. Heat is very important to life on Earth. The Sun warms our planet and helps create weather. Heat from our bodies helps them work properly. ... read more

galaxies

A galaxy is a system of dust, gas, and stars that collects over a very large area. Gravity binds the objects in a galaxy together. Within each galaxy are billions of stars. ... read more